Sharpener



FIG. 1 is a perspective view of a sharpener according to my new design;

FIG. 2 is a front elevation view, the rear elevation view being a mirror image thereof;

FIG. 3 is a right side elevation view, the left side elevation view being a mirror image thereof;

FIG. 4 is a top plan view thereof; and

FIG. 5 is a bottom plan view thereof;

FIG. 6 is a perspective view of a second embodiment of a sharpener according to my new design;

FIG. 7 is a front elevation view, the rear elevation view being a mirror image thereof;

FIG. 8 is a right side elevation view, the left side elevation view being a mirror image thereof;

FIG. 9 is a top plan view thereof; and,

FIG. 10 is a bottom plan view thereof.

The broken lines in the drawing views represent unclaimed portions of a sharpener, which are included for the purpose of illustrating unclaimed environment only, and forms no part of the claimed design. 

CLAIM The ornamental design for a sharpener, as shown and described. 